210001202122221 has 64 divisors (see below), whose sum is σ = 315039278822400. Its totient is φ = 138238345377792.

The previous prime is 210001202122207. The next prime is 210001202122253. The reversal of 210001202122221 is 122221202100012.

It is a happy number.

210001202122221 is a `hidden beast` number, since 210 + 0 + 0 + 1 + 20 + 212 + 2 + 221 = 666.

It is not a de Polignac number, because 210001202122221 - 2¹⁷ = 210001201991149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210001202122194 and 210001202122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001202122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6734461596 + ... + 6734492778.

It is an arithmetic number, because the mean of its divisors is an integer number (4922488731600).

Almost surely, 2^{210001202122221} is an apocalyptic number.

It is an amenable number.

210001202122221 is a deficient number, since it is larger than the sum of its proper divisors (105038076700179).

210001202122221 is a wasteful number, since it uses less digits than its factorization.

210001202122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35027 (or 35021 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210001202122221 its reverse (122221202100012), we get a palindrome (332222404222233).

The spelling of 210001202122221 in words is "two hundred ten trillion, one billion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".